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Method for treating gas containing sulfur oxide and NO

A technology of oxides and oxygen, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve the problems of NO oxidation catalyst poisoning, NO conversion rate decline, etc.

Active Publication Date: 2020-11-17
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors of the present invention have found that the existing NO oxidation method and the NO oxidation catalyst have the problem that the NO conversion rate decreases after being used for a period of time. The inventors of the present invention The study believes that this is due to the presence of sulfur oxides, which poison the NO oxidation catalyst.

Method used

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  • Method for treating gas containing sulfur oxide and NO
  • Method for treating gas containing sulfur oxide and NO
  • Method for treating gas containing sulfur oxide and NO

Examples

Experimental program
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Embodiment approach

[0049] The method for oxidation of NO in the gas containing sulfur oxides, oxygen and NO provided by the present invention, wherein said NO oxidation catalyst can be prepared according to existing methods, such as forming a mixture containing oxidation active components and magnesium oxide components, molding , roasting or shaping the material containing magnesium oxide components, impregnating and introducing oxidation active components, and roasting. In one embodiment, the NO oxidation catalyst includes a magnesium component, an oxidation active component and a matrix, which can be obtained by forming a mixture of the magnesium component, an oxidation active component and a matrix, molding, and roasting, or by forming a part comprising Or the mixture of all matrix and magnesium oxide components, impregnated to introduce oxidation active components and then mixed with the rest of the matrix, shaped and roasted. The step of drying may also be included before firing. Based on ...

Embodiment 1

[0082] Under the condition of vigorous stirring, 216g of triethanolamine (TEA), 25.56g of magnesium acetate and 54g of deionized water were added dropwise to 300g of TEOS, and reacted for 40min to obtain the first mixture, and then 300g of TEAOH was added dropwise to the above The second mixture is obtained from the first mixture. The second mixture was aged at 30° C. for 24 h, and then heated at 98° C. for 24 h in an air atmosphere to obtain a gel. The gel was placed in a reaction kettle and reacted at 180° C. for 16 h. Finally, the product was heated up to 600° C. for 10 h in an air atmosphere at a rate of 1° C. per minute and calcined to obtain a calcined product. Dissolve 30.56g of magnesium nitrate hexahydrate in 86.5g of deionized water, impregnate an equal volume on the roasted product, place it at room temperature for aging for 24h, then dry it in the air at 100°C for 12h, and roast at 500°C for 4h to obtain the carrier material of this example. It is the carrier mat...

Embodiment 2

[0086] 284.16g of TEOS, 18.39g of magnesium nitrate hexahydrate and 136.87g of deionized water were mixed to obtain a first mixture. Under the condition of vigorous stirring, 52.11 g of TEA was added dropwise into the first mixture at a rate of 4-6 g per minute to obtain the second mixture. The second mixture was matured at 25° C. for 16 h, and then heated at 99° C. for 24 h in an air atmosphere to obtain a gel. The gel was placed in a reaction kettle and reacted at 190°C for 48h. Finally, the product was heated to 550° C. for 10 h in air at a rate of 1° C. per minute and calcined to obtain a calcined product. Dissolve 61.53g of magnesium acetate in 81.9g of deionized water, impregnate an equal volume on the roasted product, place it at room temperature for aging for 18h, then dry it in the air at 120°C for 18h, and roast at 450°C for 5h to obtain the carrier material of this example, which is referred to as carrier Material B.

[0087] The specific surface of carrier mater...

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Abstract

A method for treating gas containing sulfur oxide and NO is disclosed. The method comprises the step that the gas containing sulfur oxide, oxygen and NO is subjected to a contact reaction with an NO oxidation catalyst, and the NO oxidation catalyst comprises a magnesium component and an oxidation active component. According to the method, in the presence of SOx, the NO conversion rate is relatively high, and in addition, the relatively high NO conversion rate can be maintained for a long time.

Description

technical field [0001] The invention relates to a treatment method for NO-containing gas, and more particularly relates to a treatment method for NO in the gas containing sulfur oxides, oxygen and NO. Background technique [0002] Sulfur oxides (SO X : SO 3 and SO 2 ) or nitrogen oxides (NO X ) is the main source of acid rain and the precursor of smog. In the process of industrial production, especially in some production processes containing heat treatment steps (drying, roasting, burning, etc.), waste gases such as tail gas or flue gas containing pollutants will also be produced. For example, in the catalytic cracking (FCC) process, part of the sulfur and nitrogen compounds in the raw material enter the coke during the riser reaction process and deposit on the spent catalyst. , Nitrogen compounds are oxidized to produce SO x , NO x and other smoke pollutants. For another example, in inorganic chemical processes such as catalyst production, when sulfates and nitrate...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/75B01D53/56B01D53/60
CPCB01D53/8628B01D53/75B01D2258/0283B01D2255/2047B01D2255/30B01D2255/2092B01D2255/2073B01D2255/20784B01D2255/20738B01D2255/20746B01D2255/20753B01D2255/20761B01D2255/1026B01D2255/1025B01D2255/1023B01D2255/1021B01D2255/1028Y02A50/20
Inventor 杨雪陈正朝林伟杜建文宋海涛潘罗其姜秋桥关淇元
Owner CHINA PETROLEUM & CHEM CORP
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